Inventor/misc/SoTranscribe.h

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/*=======================================================================
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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/


#ifndef  _SO_TRANSCRIBE_
#define  _SO_TRANSCRIBE_

#include <Inventor/misc/SoBasic.h>
#include <Inventor/SbString.h>
#include <Inventor/SbDict.h>

class SoGroup;
class SoInput;
class SoNode;
class SoOutput;

//
//  Class: SoTranSender
//
// This stores database changes that are to be transcribed. The
// changes are written to an SoOutput instance allocated and managed
// by the caller.
//
// These database change routines are supported:
//
//   INSERT node [parent n]
//      Creates and adds a node to other database. With 1 argument,
//      the node is added as the last child of the root of the
//      database. With 3 arguments, the node is added as the nth
//      child of the given parent. (The parent may be NULL to
//      indicate the root.) Note that if the inserted node is already
//      in the graph, a link is made from the parent to the existing
//      version of the node. (Therefore, if the new node is different
//      from the old one, any changes are lost.)
//
//   REMOVE parent n
//      Removes nth child from the given parent node. (The parent may
//      be NULL to indicate the root.)
//
//   REPLACE parent n newNode
//      This is exactly equivalent to "REMOVE parent n" followed by
//      "INSERT newNode parent n".
//
//   MODIFY node
//      Updates the field data for the given node to the new
//      contents. Note that this changes only field data; children of
//      groups are not affected, nor is any non-field instance data.
//

class  SoTranSender {
 public:

    SoTranSender(SoOutput *output);

  ~SoTranSender()                             {}


  SoOutput *          getOutput() const       { return out; }

  void                insert(SoNode *node);

  void                insert(SoNode *node, SoNode *parent, int n);

  void                remove(SoNode *parent, int n);

  void                replace(SoNode *parent, int n, SoNode *newNode);
  void                modify(SoNode *node);

  void                prepareToSend();

 private:
  SoOutput            *out;

  // Adding items to send
  void                addBytes(const void *bytes, size_t nBytes);
  void                addCommand(int command);
  void                addInt(int n);
  void                addNode(SoNode *node, SbBool addNames = TRUE);
  void                addNodeNames(const SoNode *root);
  void                addNodeRef(const SoNode *node);
  void                addString(const char *cmdString);

  friend class SoTranReceiver;
};

//
//  Class: SoTranReceiver
//
// An SoTranReceiver is used on the receiving end to interpret the
// data packaged up by an SoTranSender. It is given a root node that
// is the default place to add incoming nodes. The input for the
// receiver comes from an SoInput.
//

class  SoTranReceiver {

 public:

     SoTranReceiver(SoGroup *rootNode);

  ~SoTranReceiver();

  SbBool      interpret(SoInput *in);

 private:
  SoGroup     *root;
  SbDict      nameToEntryDict;        // Maps node keyname to SoTranDictEntry
  SbDict      nodeToNameDict;         // Maps node pointer to node keyname

  // Interprets one database change command (with given code) from stream.
  // Sets done to TRUE if end command was found. Returns T/F error status.
  SbBool      interpretCommand(int commandCode, SoInput *in, SbBool &done);

  // Gets a node and node names from the input
  SbBool      getNodeAndNames(SoInput *in, SoNode *&node);

  // Gets node from input
  SbBool      getNode(SoInput *in, SoNode *&root);

  // Recursively gets node names and sets up dictionaries.
  SbBool      getNodeNames(SoInput *in, SoNode *root,
                           SbBool lookForNode, SoNode *&oldRoot);

  // Gets reference to a node, looks it up in dictionary, returns
  // node pointer.
  SbBool      getNodeReference(SoInput *in, SoNode *&node);

  // Removes reference to node in dictionaries, recursively.
  void        removeNodeReferences(SoNode *node);

  // Adds an entry to the dictionaries
  void        addEntry(SoNode *node, SbName &name);

  // Deletes (frees up) an entry from the nodeDict
  static void deleteDictEntry(uintptr_t key, void *value);
};

#endif /* _SO_TRANSCRIBE_ */

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Open Inventor Toolkit reference manual, generated on 12 Feb 2024
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